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在人教版第十四章“压强和浮力”第六节“浮力的应用”教学中,浮沉条件中的悬浮实验通常是让鸡蛋悬浮在盐水中。但是,该实验对操作能力要求很高,稍微多放一点盐鸡蛋就会上浮,多加一点水鸡蛋又会下沉。笔者回想在家中洗杯子的情景,发现倒扣在水中的杯子可以浮在洗碗盆中,但用力一压后,它们又沉下去了。受此现象启发,笔者用倒置在水中的小瓶子实现了浮沉条件的教学。
In PEP 14, Chapter 6, “Application of Buoyancy,” “Pressure and Buoyancy,” the suspension experiment in the drifting conditions usually involves suspending the eggs in saline. However, the experimental requirements of operational capacity is very high, a little more put a little salt will float the egg, add a little water eggs will sink. The author recalls the scene of washing cups in the home and found that the inverted cup in the water can float in the wash bowl, but after a hard press, they sank again. Inspired by this phenomenon, I use the inverted bottle in the water to achieve the conditions of floatation teaching.